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Seasonal fluctuation in the infestation of Planorbis trivolvis with larval trematodes



Seasonal fluctuation in the infestation of Planorbis trivolvis with larval trematodes



Jour Parasitol 15(2): 121-126



This seasonal infestation has been recorded for over 6500 specimens of P. trivolvis from a small lake near St. Louis, Missouri, over a period of 2 yrs. Mature infections were detected by isolating the snails in a small amount of water; those snails from which cerca-riae did not emerge were dissected to determine the total infestation. Although the data do not show any clear-cut seasonal fluctuations, there is wide variation in degree of infestation from time to time. From the curve of percentage of mature infestations of a furcocercous species, Cercaria hamata, some inferences were drawn as to the nature of the seasonal cycle. This larva is apparently able to survive the winter in the snail host. Mature infestations of the cercaria of Plagiorchis ameiurensis, a fluke parasitic in the catfish, occurred at all seasons of the yr.[long dash]a condition which, in a temperate climate, might be expected of a form whose definitive host is present in the lake throughout the yr. The exceedingly great variation in percentage of infestation of snails with this cercaria and also the occasional appearance and disappearance of other species indicate that the larval trematode fauna of the lake is probably never in a very stable condition.

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Accession: 023569308

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DOI: 10.2307/3271345


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